krystle campbell, and 8-year-old martin richard also killed. two of the three victims who died yesterday. >>> in boston, the number of patients have been released. but dozens are still being treated at the city's hospital, some of the best in the world. >> nbc's ron allen has been at the massachusetts general hospital all day today. he has more. ron tell us the latest about the injury count, which has increased today. who is in critical condition and are there any indications at this point that the death toll may rise? >> reporter: well, jim and pat, the number of injuries has actually gone down into the 70s from about 176 at last count. so there is encouraging news in that regard. there is still perhaps 17 people in critical condition, eight here at massachusetts general hospital. their wounds are severe and horrific and have to do with the most part with lower portions of their body. remember, these were items put in lower areas, and mainly regarded the lower parts of the body. there are at least four amputees in the city. the doctors are try